package cn.xyz.it.CommonUtil;

import java.math.BigDecimal;
import java.text.DecimalFormat;

/**
 * @Description
 * @Author MissYu
 * @Date 2020/5/22 18:29
 * @Classname DataHandleUtil
 */
public class DataHandleUtil {
    /**
     * 占比计算保留小数的位数方法
     * 转成百分数
     * 当前数除以总数
     *
     * @param num1 ,num2  num1/num2
     * @return rate  保留2位小数的
     */
    public static String division(Integer num1, Integer num2) {
        String rate = "0.00%";
        //定义格式化起始位数
        String format = "0.00";
        if (num2 != 0 && num1 != 0) {
            DecimalFormat dec = new DecimalFormat(format);
            rate = dec.format((double) num1 / num2 * 100) + "%";
            while (true) {
                if (rate.equals(format + "%")) {
                    format = format + "0";
                    DecimalFormat dec1 = new DecimalFormat(format);
                    rate = dec1.format((double) num1 / num2 * 100) + "%";
                } else {
                    break;
                }
            }
        } else if (num1 != 0 && num2 == 0) {
            rate = "100%";
        }
        return rate;
    }


    /**
     * 把上面得到的百分比转为字符串类型的小数  保留两位小数
     *
     * @author shw
     */
    public static BigDecimal perToDecimal(String percent) {
        String decimal = percent.substring(0, percent.indexOf("%"));
        BigDecimal bigDecimal = new BigDecimal(decimal);
        bigDecimal.divide(new BigDecimal("100"), 4, BigDecimal.ROUND_HALF_UP);
        return bigDecimal;
    }

    public static void main(String[] args) {
        System.out.println(division(4, 20));
       /* String s = "20.00%";
        System.out.println(perToDecimal(s));*/

        int o=5;
        int p=2;
        System.out.println(o-p);
    }
}
